test.smtp.org

An SMTP interoperability machine has been setup for testing with the
open source version of sendmail 8.14.
Do not use this machine to monitor your SMTP connectivity. It
is for SMTP interoperability testing only!
If you have any questions, you may contact
postmaster@test.smtp.org.
Feedback is always welcome.

The machine test.smtp.org is configured to support:

8BITMIME

DELIVERBY

DSN

ENHANCEDSTATUSCODES

ETRN

EXPN

PIPELINING

SIZE

AUTH (SMTP Authentication) with the mechanisms:

EXTERNAL

SCRAM-SHA-1

DIGEST-MD5 with optional security layers:

3DES

DES

RC4-40

RC4-56

RC4

CRAM-MD5

PLAIN

LOGIN

ANONYMOUS

STARTTLS

VRFY

Mail sent to
bouncer@test.smtp.org will
return one message to the envelope sender of your mail and one to header
sender of your mail. You can use this to see the results of your test and
diagnose problems. NOTE: This service is currently
disabled due to abuse. If you need use of this service, contact me
as described above.

If you wish to test SMTP authentication, 20 accounts have been created
for testers to use. These accounts are of the form user01, user02, ...,
user19, and user20. Likewise, they have passwords pass01, pass02, ...,
pass19, and pass20 respectively. The realm (used by DIGEST-MD5) is set to
test.smtp.org. Check recent activity in the MTA log (see below) to make
sure nobody is using the number you are about to test with so you can
distinguish your results from others in the log.